Buffett may start out buying cigarette butts for 10 cents on the dollar in the 60s, but his investment strategy has evolved over the years due to the influence of Ken Fisher and Munger.
He is more of a growth investor nowadays than anything.
he will tell you to not expect 15-25% returns long term. As for how he invests, he personally is still a value investor and not a growth investor. Charlie Munger just got him to stop buying decent companies for great prices and focus on buying great companies for decent prices.